Revision: 6441
Author: [email protected]
Date: Mon Jan 24 05:29:39 2011
Log: Record the lazy deoptimization environmnent only at
LLazyBailout-instructions.
This saves one pointer per LIR instructions. The change relies on the fact
that there is a LazyBailout instruction at all the places where we need
to register a lazy deoptimization environment.
Review URL: http://codereview.chromium.org/6348016
http://code.google.com/p/v8/source/detail?r=6441
Modified:
/branches/bleeding_edge/src/ia32/lithium-codegen-ia32.cc
/branches/bleeding_edge/src/ia32/lithium-ia32.cc
/branches/bleeding_edge/src/ia32/lithium-ia32.h
=======================================
--- /branches/bleeding_edge/src/ia32/lithium-codegen-ia32.cc Fri Jan 21
00:30:13 2011
+++ /branches/bleeding_edge/src/ia32/lithium-codegen-ia32.cc Mon Jan 24
05:29:39 2011
@@ -414,16 +414,20 @@
// Create the environment to bailout to. If the call has side effects
// execution has to continue after the call otherwise execution can
continue
// from a previous bailout point repeating the call.
- LEnvironment* deoptimization_environment;
- if (instr->HasDeoptimizationEnvironment()) {
- deoptimization_environment = instr->deoptimization_environment();
+ LEnvironment* lazy_deoptimization_environment;
+ ASSERT(!instr->IsControl());
+ ASSERT(instructions_->at(current_instruction_ + 1)->IsGap());
+ LInstruction* next_instr = instructions_->at(current_instruction_ + 2);
+ if (next_instr->IsLazyBailout()) {
+ ASSERT(next_instr->HasEnvironment());
+ lazy_deoptimization_environment = next_instr->environment();
} else {
- deoptimization_environment = instr->environment();
+ lazy_deoptimization_environment = instr->environment();
}
- RegisterEnvironmentForDeoptimization(deoptimization_environment);
+ RegisterEnvironmentForDeoptimization(lazy_deoptimization_environment);
RecordSafepoint(instr->pointer_map(),
- deoptimization_environment->deoptimization_index());
+ lazy_deoptimization_environment->deoptimization_index());
}
=======================================
--- /branches/bleeding_edge/src/ia32/lithium-ia32.cc Mon Jan 24 01:43:14
2011
+++ /branches/bleeding_edge/src/ia32/lithium-ia32.cc Mon Jan 24 05:29:39
2011
@@ -654,22 +654,6 @@
instr->set_environment(CreateEnvironment(hydrogen_env));
return instr;
}
-
-
-LInstruction*
LChunkBuilder::SetInstructionPendingDeoptimizationEnvironment(
- LInstruction* instr, int ast_id) {
- ASSERT(instructions_pending_deoptimization_environment_ == NULL);
- ASSERT(pending_deoptimization_ast_id_ == AstNode::kNoNumber);
- instructions_pending_deoptimization_environment_ = instr;
- pending_deoptimization_ast_id_ = ast_id;
- return instr;
-}
-
-
-void LChunkBuilder::ClearInstructionPendingDeoptimizationEnvironment() {
- instructions_pending_deoptimization_environment_ = NULL;
- pending_deoptimization_ast_id_ = AstNode::kNoNumber;
-}
LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
@@ -681,8 +665,8 @@
if (hinstr->HasSideEffects()) {
ASSERT(hinstr->next()->IsSimulate());
HSimulate* sim = HSimulate::cast(hinstr->next());
- instr = SetInstructionPendingDeoptimizationEnvironment(
- instr, sim->ast_id());
+ ASSERT(pending_deoptimization_ast_id_ == AstNode::kNoNumber);
+ pending_deoptimization_ast_id_ = sim->ast_id();
}
// If instruction does not have side-effects lazy deoptimization
@@ -1877,9 +1861,7 @@
if (pending_deoptimization_ast_id_ == instr->ast_id()) {
LLazyBailout* lazy_bailout = new LLazyBailout;
LInstruction* result = AssignEnvironment(lazy_bailout);
- instructions_pending_deoptimization_environment_->
- set_deoptimization_environment(result->environment());
- ClearInstructionPendingDeoptimizationEnvironment();
+ pending_deoptimization_ast_id_ = AstNode::kNoNumber;
return result;
}
=======================================
--- /branches/bleeding_edge/src/ia32/lithium-ia32.h Mon Jan 24 01:43:14 2011
+++ /branches/bleeding_edge/src/ia32/lithium-ia32.h Mon Jan 24 05:29:39 2011
@@ -320,22 +320,11 @@
void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
HValue* hydrogen_value() const { return hydrogen_value_; }
-
- void set_deoptimization_environment(LEnvironment* env) {
- deoptimization_environment_.set(env);
- }
- LEnvironment* deoptimization_environment() const {
- return deoptimization_environment_.get();
- }
- bool HasDeoptimizationEnvironment() const {
- return deoptimization_environment_.is_set();
- }
private:
SetOncePointer<LEnvironment> environment_;
SetOncePointer<LPointerMap> pointer_map_;
HValue* hydrogen_value_;
- SetOncePointer<LEnvironment> deoptimization_environment_;
};
@@ -1881,7 +1870,6 @@
argument_count_(0),
allocator_(allocator),
position_(RelocInfo::kNoPosition),
- instructions_pending_deoptimization_environment_(NULL),
pending_deoptimization_ast_id_(AstNode::kNoNumber) { }
// Build the sequence for the graph.
@@ -1990,10 +1978,6 @@
CanDeoptimize can_deoptimize = CANNOT_DEOPTIMIZE_EAGERLY);
LInstruction* MarkAsSaveDoubles(LInstruction* instr);
- LInstruction* SetInstructionPendingDeoptimizationEnvironment(
- LInstruction* instr, int ast_id);
- void ClearInstructionPendingDeoptimizationEnvironment();
-
LEnvironment* CreateEnvironment(HEnvironment* hydrogen_env);
void VisitInstruction(HInstruction* current);
@@ -2015,7 +1999,6 @@
int argument_count_;
LAllocator* allocator_;
int position_;
- LInstruction* instructions_pending_deoptimization_environment_;
int pending_deoptimization_ast_id_;
DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
--
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